1. Division of Oral and Maxillofacial Surgery, Hospital A.G.P., Lautaro 4811230, Chile
2. Center for Morphological and Surgical Studies (CEMyQ), Universidad de La Frontera, Temuco 4811230, Chile
3. Division of Oral, Facial and Maxillofacial Surgery, Universidad de La Frontera, Temuco 4811230, Chile